It
is believed that Mosasaurs were so successful because they were able to
move into the ecological niches left vacant by the extinction of the Ichthyosaurs
(another type of marine reptile). Mosasaurs had evolved to be the dominant
carnivores in many marine environments around the world, feeding on fish,
squid, ammonites, and even other Mosasaurs. (Bakker,
1993)
